2009 Impala door lock problem

I have a 09 Impala. Only the driver door has a problem unlocking. All other doors lock/unlock no problems. When putting the car from drive to park the door should unlock but have started having problems with that recently. Before that started it was using the remote to unlock. Again all other door are not affected, they unlock fine. I now have to use the key to unlock the drivers side door. Any/all help is appreciated.

Well, could be any number of things.....bad actuator, bad BCM, or wiring problem......my money is on the actuator.....

Only way to know for sure is to remove the door panel, disconnect the harness to the actuator and operate the switch to see if you have power/ground to the actuator....if you do, it's the actuator....if you don't, it gets more involved checking circuits for continuity.....